Flexible thiol–ene crosslinked reduced graphene oxide-functionalized styrene-butadiene-styrene films with enhanced thermal conductivity and electromagnetic interference shielding efficiency

With the rapid advancement and widespread use of electronic devices, products are becoming increasingly miniaturized and multifunctional. This trend necessitates the development of polymeric films with both high thermal conductivity and strong electromagnetic interference (EMI) shielding effectiveness (SE). Moreover, the demand for stretchable and recoverable electronic materials has grown due to the diverse operating environments of modern devices. In this work, a multifunctional film was fabricated by combining the thermoplastic elastomer poly(styrene-butadiene-styrene) (SBS) with modified reduced graphene oxide (RGO) via a simple “thiol–ene” click reaction followed by vacuum-assisted filtration. The resulting composite film, with a thickness of only 47 μm, exhibits an outstanding specific EMI SE (SEt) of 2300 dB/cm and a high thermal conductivity of 4.7 W/m·K. Furthermore, the film exhibits excellent electromechanical stability, retaining its original electrical resistance even under 60% tensile strain, and shows self-healing behavior at elevated temperatures. This work not only presents a viable approach for designing high-performance stretchable films, but also underscores the potential of SBS as a versatile polymer matrix for next-generation thermal management and EMI shielding applications.